Valve-gear.



E. TURNER. VALVE GEAR.

APPLICATION FILED DEC. 1, 1910.

1,028,158. Patented June 4, 1912,

2 SHEBTS-SHEET 1.

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E. TURNER.

VALVE GEAR.

APPLICATION FILED DEG. 1, 1910.

Patented June 4, 1912.

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PM a M Ermsaz Turner COLUMBIA PLANOGRAPH c0.,WAsl-IINOTON. n. b.

eras r onnrcn VALVE-GEAR.

Specification of Letters Patent.

Patented June 4t, 1912.

Application filed December 1, 1910. Serial No. 595,079.

To all whom it may concern:

Be it known that I, ERNEST TURNER, a citizen of the United States,residing at Dadeville, in the count-y of Tallapoosa and State ofAlabama, have invented certain new and useful Improvements in Valve-Gear, of which the following is a specification.

This invention relates to valve gear designed more especially for use onlocomotives; and is an improvement on whatis known as the Walschaertvalve gear in that it has fewer parts, is more simple in construction,can be applied to any style of locomotive without change in cylinders orvalves, and is more easily kept in good working condition as all theparts are outside and the wearing members being principally pins, can bereadily and cheaply re newed when necessary.

The object of this invention is to provide a variable cut-off which isobtained by mounting the valve operating rocker arm on a shaft, thebearing of which is movable in a straight line parallel to the directionof movement of the slide valve and transversely of the shaft, saidmovement being caused by the oscillation of the reversing link throughthe medium of a radius-bar extending from the sliding link-block to therock shaft. The extent of lateral movement imparted to the rock shaftdepends upon the position of the link-block relative to the center ofoscillation of the link, the movement increasing directly as thelink-block is moved from said center.

lVith this object in view, the invention consists in the combination andarrangement of parts hereinafter described in detail, illustrated in theaccompanying drawings and pointed out in the appended claims, it beingunderstood that but one embodiment of the invention is shown anddescribed herein, and that various changes in size, proportion and otherfeatures may be made within the scope of the claims with out departingfrom the spirit of the invention.

In the accompanying drawing,Figure 1 is a side elevation of the improvedmechanism applied to a locomotive. Fig. 2 is a plan view of the same.Fig. 3 is an elevation of a detail of the invention partly in section.Fig. 4 is a sectional view on the line 4 4 of Fig. 3, and Fig. 5 is aview of a modification.

In the drawings, A indicates one of the cylinders of a locomotiveengine, B the steam chest within which is a slide valve of any kind, Cthe piston rod, D the cross head, E and F cross-head guides, Gr, H twoof the driving wheels, and I the connecting rod extending from the crosshead to the crank pin K on the driving wheel H, such parts being commonto all types of locomotives.

Bolted fast on the upper cross-head guide E is a plate 10 from whichproject two lugs 11 spaced apart, one in front of the other. Througheach lug is bored a hole 12, the axes of said holes alining and inparallel relation to the piston rod C. Between the lugs 11 is a bearing13 for a rocking shaft 14, said bearing being narrower than the spacebetween the lugs, and having oppositely projecting pins 15 snuglyfitting the holes 12 in the lugs 11 and adapted to slide therein in adirection parallel to the move ment of the slide valve. Fastened on theinner end of the rock shaft 14 is a short lever arm or rocker 16pivotally connected with the valve stem 17 as shown. The opposite orouter end of the rock shaft let carries a long lever arm or rocker 18,preferably extending below the lower guide F where it is attached by apin joint to a connecting rod 19 pivoted to a bracket or arm 20 securedon the cross-head D. As the cross-head reciprocates the lever arm 18 isrocked which, through the connections described, operates the valve inthe valve chest B in the usual way.

Bolted on the upper guide E at its rear end is a bearing 21 to which ispivoted at its center a curved plate or link 22, its axis of curvaturecorresponding to the axis of the rock shaft 14. Slidably mounted on thelink 22 is a link-block 23 which can be moved from one end of said linkto the other by means of a rod 24.- running to the reversing lever inthe cab of the locomotive. The rod 24 is connected with one arm of abell-crank lever 25 mounted on a tumbling shaft 26. The other arm 27 ofsaid lever, through a suspension rod 28, is connected to a pin 29 on thelink-block 23. A radius bar 30 extends from the rock shaft 14 on whichit is journaled to the link-block 23, on the pin 29 of which it ismounted. An arm 31 depends from the lower end of the link 22 for one endof the eccentric rod 32 pin journaled thereto, the other end of said rodbeing pivoted on the free end of an arm 33 keyed on the crank pin K inthe manner common to the 'Walschaert type of valve gear mechanism.

In operation, the rocker arm 18 is oscillated in the movable bearing 13by means of the cross-head D through the connecting rod 19, and givesthe slide valve in the steam chest B its reciprocatory movement. Whenthe link-block 28 is in on the center of oscillation of the link 22, thebearing 18 and rock shaft will have no transverse movement, and the leadand lap of the slide valve will be caused entirely by the swing of therocker arm. To get a variable cut-off, the link-block is moved above orbelow the center of the link 22, and as said link is oscillated by theeccentric arm 22, the bearing and shaft will be moved in the directionof reciprocation of the slide valve, said valve will be given a shortermovement and increase the cut-off of said valve.

The rock shaft is shown in the preferred form of the invention with thearms 16 and 18 attached to its opposite ends. A modified construction isillustrated in Fig. 5, wherein the two arms are made from a singlestraight piece 3 1- fastened 011 the outer end of the rock shaft.

It is to be understood that locomotives equipped with the Stephenson orordinary link motion for operating the valves can be easily and quicklyprovided with the above described valve gear at small cost as thepresent cylinders, valve chests and valves are retained, and the partsadded are few and supported on the cross head guides.

This device is a great improvement over the W alsehaert valve gear whichnecessitates the addition of new cylinders because a wider spread of thesteam chest is demanded, or else an additional rocker must be employedwhich makes the operation indirect, is expensive, and does not givesatisfaction because of the complication involved.

lVhat I claim is 1. A valve gear mechanism com-prising a support securedupon the upper cross-head guide, having upstanding spaced apart lugsthereon, said lugs having alining openings transversely therethrough, abearing disposed between said lugs having laterally projecting pintles.adapted to enter the openings in said lugs whereby said bearing isslidingly supported, a shaft rotatably mounted in said bearing, arocking arm secured to said shaft intermediate its ends, said rockingarm being pivoted at its upper end to the valve for operating the same,a cross-head connected to the opposite end of said arm for rocking thearm, and a link motion loosely connected to said shaft whereby saidhearing may be moved sidewise on its pintles in a straight line parallelto the direction of movement of the crosshcad for varying the lap andlead of said valve. 7

2. A valve gear mechanism comprising a 7 support secured upon the uppercross-head guide having upstanding spaced-apart lugs thereon, said lugshaving alining openings transversely therethrough, a bearing disposedbetween said lugs having laterally projecting pintles adapted to enterthe openings in said lugs whereby said bearing isslidinglysupported,arocking shaft mounted in said bearing, an upstandingarm fast on said shaft at one end thereof, said arm connected at itsupper end to the valve for operating the same, a combination lever faston said shaft at its opposite end, a crosshead connected to said leverfor rocking the same, a radius bar of a link motion loosely connected tosaid shaft between the bearing and the combination lever, whereby saidbearing may be moved sidewise on its pintles in a straight line parallelto the direction of movement of the cross-head for varying the lap andlead of said valve, the side wise movement of said bearing being limitedby said lugs.

In testimony whereof I aflix my signature in presence of two witnesses.

ERNEST TURNER.

l/Vitnesses WM. LAOKEY, B. B. BRIDGES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

